Acta Chimica Sinica ›› 2006, Vol. 64 ›› Issue (22): 2225-2230. Previous Articles     Next Articles

Original Articles


李霞*,1, 童华2, 王志勇2, 汪存信2   

  1. (1湖南科技大学化学化工学院 湘潭 411201)
    (2武汉大学化学与分子科学学院 武汉 430072)
  • 收稿日期:2006-02-27 修回日期:2006-06-26 出版日期:2006-11-28 发布日期:2006-11-28
  • 通讯作者: 李霞

Effects of Sm3+ on the Crystallization of Calcium Ox-alate in Pure H2O System

LI Xia*,1; TONG Hua2; WANG Zhi-Yong2; WANG Cun-Xin2   

  1. (1 School of Chemistry and Chemical Engineering, Hunan University of Science and Technol-ogy, Xiangtan 411201)
    (2 College of Chemistry and Molecular Science, Wuhan Uni-versity, Wuhan 430072)
  • Received:2006-02-27 Revised:2006-06-26 Online:2006-11-28 Published:2006-11-28
  • Contact: LI Xia

In this paper the control effects of lanthanide ion (Sm3+) on the crystallization of calcium ox-alate (CaC2O4) in pure H2O system were investigated. By microcalorimetry, the effects of Sm3+on the crystallization kinetics of CaC2O4 were studied. Moreover, the control effects of Sm3+on the crystal structure, morphology, and size were investigated by X-ray diffraction (XRD) and scanning elec-tromicroscopy (SEM). The microcalorimetric results showed that the effects of Sm3+were not only on the initial nucleation of CaC2O4 but also on the crystal growth, and the optimal inhibition effects can be obtained only at appropriate concentration of Sm3+ (~2.50×10-5 mol•L-1). The XRD results showed that under given condi-tions, the addition of Sm3+ favors the formation of dihydrate (COD). The SEM results showed that the addition of Sm3+ causes significant controls on the crystal shape and size of CaC2O4, namely crystals with different morphologies and different sizes will be obtained as the concentration of Sm3+ varies.

Key words: lanthanide ion, calcium oxalate, microcalorimetry, crystallization kinetics, dihydrate, control effect